Donald Trump's team is braced for the prospect of more damaging leaks in the final weeks of the campaign, as opponents warn of more "mega bombs" to come.

Fox News correspondent Ed Henry said former Republican candidate and now Trump supporter, Ben Carson, discussed the prospect of more revelations with him recently.

"They have more things and they will drip them out," he said on Twitter about his conversation with one of Trump's most high-profile backers.

Fox News contributor and journalist Guy Benson has said a Trump opponent told him "at least two more mega bombs are waiting to fall on Trump's head before November 8".

"This individual declined to offer any more information when I sought further information, so it's probably wise to take this information of a grain of salt," he wrote on Townhall.com.

"In my judgment, that's much closer to sexualised 'locker room banter' than what voters heard on the Access Hollywood tape.""Then again, CNN has already reported comments from Trump during an interview with Howard Stern in which he assented to allow the host to refer to his daughter, Ivanka, as a 'piece of ass'.

Meanwhile The Apprentice producer Bill Pruitt, who worked on the first and second series of the show, said there is more damaging footage buried in the archives.

"When it comes to the #Trumptapes there are far worse," he tweeted, following the revelation of the tape that dominated the second Presidential debate.

Hillary Clinton supporter David Brock, who has founded a superPAC to raise funds for the Democratic contender even promised to cover the reported $5 million penalty for breaching a nondisclosure clause associated with the show.

"If a $5 million 'leak fee' is what stands between truth and total Trump implosion, sign me up," he said in an email to Buzzfeed.

The comments will have Trump's team bracing for more revelations following extraordinary footage captured on a hot mic that proved a bombshell when it was released after being leaked to the Washington Post.

An NBC source said Access Hollywood was prompted to check their archives after the Associated Press ran a story based on accounts from insiders who claimed Trump rated women by the size of their breasts and talked about who he would like to have sex with.

One former staff member who had signed a nondisclosure agreement recalled how Trump asked the men whether they wanted to sleep with another woman in front of her.

"We were in the boardroom one time figuring out who to blame for the task, and he just stopped in the middle and pointed to someone and said, 'You'd f**k her, wouldn't you? I'd f**k her. C'mon, wouldn't you?'"

The Access Hollywood tape of a conversation with Billy Bush caught Trump saying how he tried to sleep with Nancy O'Dell while she was married.

"I moved on her actually, she was down in Palm Beach and I failed. I'll admit it. I did try to f**k her, she was married ... and I moved on her very heavily," he said.

"You know I'm automatically attracted to beautiful - I just start kissing them. It's like a magnet. Just kiss. I don't even wait."

"And when you're a star they let you do it," he adds. "You can do anything ... Grab 'em by the p***y."

On Sunday further video showed Trump saying it was "fortunate I don't have to run for political office" when asked about his womanising in New Zealand 23 years ago.

Fox News host Geraldo Rivera has also come forward to claim he has more tapes featuring Trump that "in the context of the current climate, would be embarrassing".

Speaking on The Five Sunday he said: "He's never used the P-word in front of me, I'll say that."

"But I never saw him come onto any of the beautiful women on the program."

Since the debate Clinton has jumped six points ahead of Trump in the polls according to one by The Economist and YouGov, while election tracker FiveThirtyEight puts her chance of winning at more than 80 per cent.

The latest shocking audio is one in a number of scandals that have painted a disastrous picture of the billionaire when it comes to women, following earlier revelations he referred to a Miss Universe contestant as Miss Piggy which dominated the first debate.

However rather than attempt to draw a line under it on Sunday, Trump attacked Clinton and her husband Bill, calling her the "devil" and saying he was the worst thing that had happened to women.

It prompted his running mate Mike Pence to cancel engagements and "pray" for Trump and his family, while high-profile Republicans Condoleezza Rice and Arnold Schwarzenegger withdrew their support.

Republican National Committee chief strategist Sean Spicer said the party is "working to evaluate the appropriate messaging going forward", amid last-ditch calls for Trump to withdraw.